Consolidate instructions

BUILD.md

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+# Build instructions
+
+Typically build the CBDT then the COLRv1 as COLRv1 copies some information from CBDT.
+
+## CBDT
+
+```bash
+rm -rf venv  # in case you have an old borked venv!
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+rm -rf build/ && time make -j 48
+# Should take 2-3 minutes to create noto-emoji/NotoColorEmoji.ttf
+
+mv *.ttf fonts/
+```
+
+## COLRv1
+
+```bash
+# If you are updating to a new Unicode rev, update configs
+(cd colrv1 && python colrv1_generate_configs.py)
+git diff colrv1/*.toml
+
+# Compile the fonts
+(cd colrv1 && rm -rf build/ && time nanoemoji *.toml)
+cp colrv1/build/NotoColorEmoji.ttf fonts/Noto-COLRv1.ttf
+cp colrv1/build/NotoColorEmoji-noflags.ttf fonts/Noto-COLRv1-noflags.ttf
+
+# Post-process them
+python colrv1_postproc.py
+```
+
+## Emojicompat
+
+TODO detailed instructions

colrv1/README.md

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-# COLRv1 Build
-
-We assume the bitmap version with equivalent coverage exists and
-contains emojicompat metadata.
-
-## Build Steps
-
-1. Check the list of sources in the config files is in sync with the current sources
-
-   ```shell
-   # running from the noto-emoji repository root directory
-   python colrv1_generate_configs.py
-   git diff colrv1/*.toml
-   ```
-
-   If configs are in sync, the `colrv1/*.toml` files should contain no diffs.
-
-1. Compile the COLRv1 fonts
-
-   ```shell
-   time nanoemoji *.toml
-   cp build/NotoColorEmoji.ttf ../fonts/Noto-COLRv1.ttf
-   cp build/NotoColorEmoji-noflags.ttf ../fonts/Noto-COLRv1-noflags.ttf
-   ```
-
-1. Post-process COLRv1 fonts
-   * Adds some additional sequences, fixes up `name`, etc
-   * At time of writing only the noflags version is for Android
-
-   ```shell
-   # Assumed to be in a python3 environment with requirements.txt fulfilled
-   python colrv1_postproc.py
-   ```
-
-1. Add emojicompat metadata to the Android font and pass to the Android team
-   * TODO write detailed instructions